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Fatigue: Cracks caused by metal fatigue

Description

The Fatigue data frame has 262 rows and 3 columns.

Arguments

source

Lu, C. Joséph , and Meeker, William Q. (1993), Using degradation measures to estimate a time-to-failure distribution, Technometrics, 35, 161-174

Details

These data are given in Lu and Meeker (1993) where they state ``We obtained the data in Table 1 visually from figure 4.5.2 on page 242 of Bogdanoff and Kozin (1985).'' The data represent the growth of cracks in metal for 21 test units. An initial notch of length 0.90 inches was made on each unit which then was subjected to several thousand test cycles. After every 10,000 test cycles the crack length was measured. Testing was stopped if the crack length exceeded 1.60 inches, defined as a failure, or at 120,000 cycles.